I know MGM has a special fireworks display and I think the MK and EPCOT do to. SSE has images of landmarks in the USA on the outside.
HERES A TIP: Avoid the MK and Epcot on the 4th!!!!! Every1 wants to be in those two parks and u can't even move without bumping into some1. The wait for Splash Mt. was 3 hrs! my family left and went to MGM. It was like a ghostown there. At 2 o clock the wait for the TOT and RRC were only 10 minutes.